Why this is legal to write uint_64(x)?

[warrener]

typedef uint_64 Time;

Time x = 123;
Time y = Time(x);

The second line looks like a constructor! But Time is nothing more than a build-in type. Is this legal and why?

[laitinen]

if uint_64 is a valid typedef then the code is legal.

You are only assigning the value of x to y (you are also doing an unecessary explicit cast).

It is just like writing:

int x = 123;
int y = x;

Laitinen

[exterminator]

This is legal although it does not mean those types have a constructor. This syntax helps in template metaprogramming.